# Air Plan Approval; Illinois; NAAQS Update
> **Rule** · Final rule. · Published 2024-01-17 · Effective 2024-02-16 · 89 FR 2883
## Document
- **Document number:** 2024-00658
- **Category:** air-emissions
- **Federal Register citation:** 89 FR 2883
- **CFR reference:** 40 CFR 52
- **Publication date:** 2024-01-17
- **Effective date:** 2024-02-16
- **State:** IL
- **EPA docket:** EPA-R05-OAR-2022-0673
## Abstract

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the Illinois Environmental Protection Agency (IEPA) on July 8, 2022. Illinois revised its air pollution control rules entitled "Part 243--Ambient Air Quality Standards" and updated the "List of Designated Reference and Equivalent Methods" in response to EPA rulemakings and changes to the National Ambient Air Quality Standards (NAAQS) that EPA adopted in 2021.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/01/17/2024-00658/air-plan-approval-illinois-naaqs-update)
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